I think i am able to reproduce this glitch.Go to desktop icon of avast double click to open avast GUI/UI next go to Protection tab click to open next goto Core Shields and click there you see the glitch.

Once the GUI is opened, clicking Core Shields under Protection results in a delay of up to 10 seconds before the window is populated but minus the 'gear' icon for Settings window. The gear icon never appears. Clicking for the GUI via avast system tray and then following the same steps shows no glitch and the Settings gear icon is present at all times

Also noted during install process that the standard avast icon on the desktop was removed (Clean install here) and not re-installed when installation was complete

Bug is similar in some ways to Bank Mode issue discussed elsewhere in the forum.